12乘以6+72乘以49用简便方法怎么做
问题描述:
12乘以6+72乘以49用简便方法怎么做
答
12*6+72*49
=72+72*49
=72(1+49)
=72*50
=3600谢谢,我很满意不谢,愿意效劳